Graphics Programs Reference
In-Depth Information
Profile terminology
Familiarizing yourself with the following terms will be helpful as you work with
design profiles:
tangent
The straight-line portions of a profile.
Pvi (Point of vertical intersection)
The location where two tangents
intersect.
PvC (Point of vertical Curvature)
The beginning of a vertical curve.
Pvt (Point of vertical tangency)
The end of a vertical curve.
Parabolic Curve
A vertical curve that doesn't have a constant radius and
follows the shape of a parabola.
Circular Curve
A vertical curve that has a constant radius.
Asymmetric Curve
A vertical curve that is created from two back-to-back
parabolic curves.
Crest Curve
A vertical curve at the top of a hill where the grade leading into
the curve is greater than the grade leading out. The PVI is located above the curve.
Sag Curve
A vertical curve at the bottom of a valley where the grade leading
into the curve is less than the grade leading out. The PVI is located below the curve.
4.
Verify that Profile Style is set to Design Profile and Profile Label set is
set to _No Labels. Click OK.
5.
On the Profile Layout Tools toolbar, click the small black triangle on
the far-left button to expand it, and then click Draw Tangents With
Curves (see Figure 7.2).
FiGuRE 7.2
Invoking the Draw
Tangents With Curves command
This configures Civil 3D
so that your cursor will
recognize center points
and lock on (snap) to
them automatically.
6.
Press and hold the Shift key, and then right-click. Click Osnap
Settings at the bottom of the shortcut menu.
7.
In the Drafting Settings dialog box, uncheck all boxes except Object
Snap On (F3) and Center. Click OK.
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